rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 ticks this GP) idle=a904/1/0x4000000000000000 softirq=38678/38681 fqs=9
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P8608
rcu: 	(detected by 0, t=10502 jiffies, g=28753, q=259 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 8608 Comm: syz.0.488 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__this_cpu_preempt_check+0x0/0x20
Code: 16 b0 b8 f5 eb a7 e8 8f e4 ff ff 66 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 89 fe 48 c7 c7 80 3e e3 8b e9 bd fe ff ff cc cc cc
RSP: 0018:ffffc900001e0810 EFLAGS: 00000046
RAX: 64d322f6df38f518 RBX: 0000000000000087 RCX: 2931fd28d95c7a00
RDX: 0000000000000002 RSI: ffff888136627a98 RDI: ffffffff8dba984d
RBP: ffff8880215744c0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200003c100 R12: 0000000000000002
R13: 0000000000000002 R14: ffff888136627a98 R15: ffff888021573980
FS:  00007f0b526306c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b525eed58 CR3: 0000000109460000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 lock_release+0x27a/0x3e0
 _raw_spin_unlock_irqrestore+0x70/0x110
 hrtimer_try_to_cancel+0x3be/0x420
 hrtimer_cancel+0x3b/0x50
 cpu_clock_event_stop+0xd9/0x130
 __perf_event_overflow+0x580/0xe40
 perf_swevent_hrtimer+0x3c5/0x550
 __hrtimer_run_queues+0x4e0/0xc60
 hrtimer_interrupt+0x45b/0xaa0
 __sysvec_apic_timer_interrupt+0x10b/0x410
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:batadv_hardif_get_by_netdev+0x164/0x3b0
Code: f6 4c 8b 3d 4e 98 bb 0e 49 81 ff 20 56 01 9a 0f 84 7f 01 00 00 4c 89 74 24 08 49 8d 5f 18 48 89 d8 48 c1 e8 03 42 80 3c 20 00 <74> 08 48 89 df e8 52 84 dd f6 4c 39 33 74 0a e8 58 03 7a f6 e9 dc
RSP: 0018:ffffc9000603f920 EFLAGS: 00000246
RAX: 1ffff110072aeb03 RBX: ffff888039575818 RCX: 0000000000080000
RDX: ffffc900037b9000 RSI: 0000000000006b18 RDI: 0000000000006b19
RBP: ffffc9000603f9d0 R08: 0000000000000000 R09: ffffffff8b45bd0e
R10: dffffc0000000000 R11: ffffffff8b45fcb0 R12: dffffc0000000000
R13: dffffc0000000000 R14: ffff88803e59c000 R15: ffff888039575800
 batadv_hard_if_event+0x82/0x1730
 notifier_call_chain+0x1b6/0x3e0
 __dev_notify_flags+0x18d/0x2e0
 netif_change_flags+0xe8/0x1a0
 dev_change_flags+0x130/0x260
 dev_ioctl+0x7b4/0x1150
 sock_do_ioctl+0x22c/0x300
 sock_ioctl+0x576/0x790
 __se_sys_ioctl+0xfc/0x170
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0b5178eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f0b52630038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0b519d5fa0 RCX: 00007f0b5178eba9
RDX: 0000200000000080 RSI: 0000000000008914 RDI: 0000000000000009
RBP: 00007f0b51811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0b519d6038 R14: 00007f0b519d5fa0 R15: 00007ffc286e6e48
 </TASK>
task:syz.0.488       state:R  running task     stack:23224 pid:8608  tgid:8607  ppid:7644   task_flags:0x400140 flags:0x0000400a
Call Trace:
 <TASK>
 </TASK>
rcu: rcu_preempt kthread starved for 10460 jiffies! g28753 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:27080 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00004000
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 schedule_timeout+0x12b/0x270
 rcu_gp_fqs_loop+0x301/0x1540
 rcu_gp_kthread+0x99/0x390
 kthread+0x711/0x8a0
 ret_from_fork+0x439/0x7d0
 ret_from_fork_asm+0x1a/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 8607 Comm: syz.0.488 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70
Code: 8b 3d 94 73 fe 0b 48 89 de 5b e9 73 af 58 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 d0 a0 92 65 8b 15 b8 0e e1 10 81 e2 00 01 ff 00
RSP: 0018:ffffc900061bfa38 EFLAGS: 00000202
RAX: ffffffff81b44b4f RBX: ffffc900061bfa88 RCX: ffff888038bdb980
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900061bfb30 R08: ffffc900061bf8e7 R09: 1ffff92000c37f1c
R10: dffffc0000000000 R11: fffff52000c37f1d R12: 1ffff92000c37f51
R13: dffffc0000000000 R14: 1ffff92000c37f4c R15: 1ffff92000c37f4c
FS:  000055559469f500(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b525edfc8 CR3: 0000000109460000 CR4: 00000000000006f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 smp_call_function_single+0x3bf/0x590
 event_function_call+0x326/0x970
 perf_event_release_kernel+0x15d/0x510
 perf_release+0x38/0x50
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xec/0x110
 do_syscall_64+0x2bd/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f0b5178eba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc286e6fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f0b519d7da0 RCX: 00007f0b5178eba9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f0b519d7da0 R08: 000000000000023c R09: 0000001e286e729f
R10: 00007f0b519d7cb0 R11: 0000000000000246 R12: 0000000000043afc
R13: 00007f0b519d6180 R14: ffffffffffffffff R15: 00007ffc286e70c0
 </TASK>
